Could not create a Bloch Sphere!

[Abdulsalam Odofin]

Hello,

I am trying to create a Bloch sphere with QuTiP, but could not. I will be glad if you could help me out. Here is my code; Thank you!

from qutip import *

import numpy as np

import matplotlib.pyplot as plt

b = qutip.Bloch()

b.make_sphere()

pnt = [1/np.sqrt(3), 1/np.sqrt(3), 1/np.sqrt(3)]

b.add_points(pnt)

b.render()